부산대학교 도서관

In order to explore the latest sowing date of alfalfa in Qiqihar, Longmu 803 alfalfa was used as experimental material, to study the effect of alfalfa on emergence days, overwintering rate, root growth and grass yield by setting different late sowing periods. The results showed that the number of emergence days of alfalfa sown from July 8 to July 29 was the shortest, which was four days. The diameter of root neck, depth of root neck into soil, diameter of main root, length of main root, number of fibrous roots, number of branches and wintering rate of alfalfa all decreased with the delay of sowing date except T1 sown on July 1. The forage yield of alfalfa sown on July 8 was the highest, which was 11 302.79 kg/hm2 on July 8, and the yield of other treatments decreased with the sowing date. The study indicates that the latest sowing date for alfalfa to survive the winter in Qiqihar should be before July 22. [ABSTRACT FROM AUTHOR]